Refactor show devMenu command (#2242)

* Refactor show devMenu command

* Refactor reload command

Author: lexie011

src/extension/commands/reloadApp.ts

@@ -17,9 +17,6 @@ export class ReloadApp extends Command {
     );
 
     async baseFn(): Promise<void> {
-        await this.reloadApp();
-    }
-    public async reloadApp(): Promise<void> {
         assert(this.project);
         await sendMessageToMetro("reload", this.project);
     }

src/extension/commands/showDevMenu.ts

@@ -5,10 +5,7 @@ import * as assert from "assert";
 import * as nls from "vscode-nls";
 import { ErrorHelper } from "../../common/error/errorHelper";
 import { InternalErrorCode } from "../../common/error/internalErrorCode";
-import { PlatformType } from "../launchArgs";
-import { AndroidPlatform } from "../android/androidPlatform";
-import { IOSPlatform } from "../ios/iOSPlatform";
-import { getRunOptions } from "./util";
+import { sendMessageToMetro } from "./util";
 import { Command } from "./util/command";
 
 nls.config({
@@ -28,25 +25,6 @@ export class ShowDevMenu extends Command {
 
     async baseFn(): Promise<void> {
         assert(this.project);
-
-        const androidPlatform = new AndroidPlatform(
-            getRunOptions(this.project, PlatformType.Android),
-            {
-                packager: this.project.getPackager(),
-            },
-        ) as AndroidPlatform;
-
-        androidPlatform.showDevMenu().catch(() => {});
-
-        if (process.platform === "darwin") {
-            const iosPlatform = new IOSPlatform(getRunOptions(this.project, PlatformType.iOS), {
-                packager: this.project.getPackager(),
-            });
-
-            iosPlatform.showDevMenu(this.project).catch(() => {});
-        }
-        if (process.platform === "win32") {
-            // TODO: implement Show DevMenu command for RNW
-        }
+        await sendMessageToMetro("devMenu", this.project);
     }
 }